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Electromagnetism

 Topic Review on "Title": Magnetic flux: A measurement of the number of magnetic field lines passing through a particular area or surface. Faraday’s law: The voltage induced is directly proportionoal to the number of loops and the change in the magnetic flux.  It is inversely proportional to the time that this change occurs throughout. Lenz’s law: The induced emf always gives rise to a current whose magnetic flux opposed the original change in magnetic flux.  Thus, the induced current tries to maintain the level of magnetic flux. Electromotive force: A voltage that gives rise to a current flow.  This voltage can be induced or created by a changing magnetic field. Right hand rule, RHR: The fingers extend or curl in the direction of the magnetic field.  The outstretched thumb points in the direction of conventional current. Generator: A machine that produces electricity by a rotating coil of wire immersed in a stationary magnetic field.  This rotating motion could be obtained from a variety of sources. Self Inductance: The situation where a changing current in coil creates an induced emf Mutual Inductance:  The situation where the changing current in one coil creates an induced emf in another coil even though they are not physically touching at all

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 "Title" Tutorial Summary : Magnetic flux describes the number of magnetic field lines passing through a particular area.  This idea is similar to rain falling through a hula hoop.  Faraday’s law describes the induced electromotive force as the change in flux per amount of time. Lenz’s law describes the direction of that induced current.  Again, the right hand rule can be utilized.  A conductor moving through a magnetic field can also create an induced electromotive force.  These concepts are the basis for an electric generator.  Mechanical motion is converted into electric energy.

 Tutorial Features: Specific Tutorial Features: Animation showing the relationship between magnetic flux and the induced current. Diagrams and animations showing induced emfs in moving conductors. Series Features: Concept map showing inter-connections of new concepts in this tutorial and those previously introduced. Definition slides introduce terms as they are needed. Visual representation of concepts Animated examples—worked out step by step A concise summary is given at the conclusion of the tutorial.

 "Title" Topic List: Magnetic flux Formula Angle Units Hoop analogy Example Faraday’s law Formula Induced electromotive force Example Lenz’s law Right hand rule application Examples Electromotive force in a moving conductor Applications

See all 24 lessons in high school  physics, including concept tutorials, problem drills and cheat sheets:
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